openapi: 3.1.0
info:
  title: Itch.io Auth API
  description: The itch.io server-side API provides authenticated access to user profiles, uploaded games, download key validation, purchase lookup, and build version retrieval. Authentication is via API key or short-lived JWT tokens using the Authorization Bearer header. Responses are JSON with snake_case naming and RFC 3339 dates.
  version: 1.0.0
  contact:
    name: Itch.io Support
    url: https://itch.io/support
  license:
    name: Proprietary
    url: https://itch.io/docs/legal/terms
servers:
- url: https://api.itch.io
  description: Itch.io API Server
security:
- bearerAuth: []
tags:
- name: Auth
  description: Authentication operations
paths:
  /login:
    post:
      operationId: loginWithPassword
      summary: Login with password
      description: Attempts to log a user into itch.io with their username (or email) and password. The response may indicate that TOTP or recaptcha is needed.
      tags:
      - Auth
      security: []
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              type: object
              required:
              - username
              - password
              properties:
                source:
                  type: string
                  description: Source surface (e.g. desktop)
                  example: desktop
                username:
                  type: string
                  description: Username or email address
                password:
                  type: string
                  description: Account password
                recaptcha_response:
                  type: string
                  description: Recaptcha response token if required
                force_recaptcha:
                  type: boolean
                  description: Force recaptcha challenge
      responses:
        '200':
          description: Successful response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/LoginWithPasswordResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /login/with-totp-token:
    post:
      operationId: totpVerify
      summary: Verify TOTP token
      description: Verifies a TOTP (two-factor authentication) code after the initial login step.
      tags:
      - Auth
      security: []
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              type: object
              required:
              - token
              - code
              properties:
                token:
                  type: string
                  description: Token from the initial login response
                code:
                  type: string
                  description: TOTP code from authenticator app
      responses:
        '200':
          description: Successful response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TOTPVerifyResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    LoginWithPasswordResponse:
      type: object
      properties:
        recaptchaNeeded:
          type: boolean
        recaptchaUrl:
          type: string
          format: uri
        totpNeeded:
          type: boolean
        token:
          type: string
          description: Short-lived token for TOTP verification
        key:
          $ref: '#/components/schemas/APIKey'
        cookie:
          type: object
          additionalProperties:
            type: string
          description: Session cookie key-value pairs for browser session
    ErrorResponse:
      type: object
      properties:
        errors:
          type: array
          items:
            type: string
    APIKey:
      type: object
      description: Grants access to the itch.io API within a certain scope
      properties:
        id:
          type: integer
          format: int64
        userId:
          type: integer
          format: int64
        key:
          type: string
        createdAt:
          type: string
          format: date-time
        updatedAt:
          type: string
          format: date-time
        sourceVersion:
          type: string
    TOTPVerifyResponse:
      type: object
      properties:
        key:
          $ref: '#/components/schemas/APIKey'
        cookie:
          type: object
          additionalProperties:
            type: string
  responses:
    Unauthorized:
      description: Authentication is required or credentials are invalid
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: API key or JWT token issued by itch.io